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drive oil leak 1999 (2655)-gctid819420

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    drive oil leak 1999 (2655)-gctid819420

    I own a 1999 Bayliner Cierra 2655 Merc 5.0 . I recently noticed gear lube in my bildge. i also noticed lube oil on top of the resovoir. I cleaned the entire resovoir with degreaser and filled it halfway. I took the boat for a ride with the engine hatch open and a friend holding the resovoir in his hand. As we drove , we noticed gear oil leaking from the cap on the top of the resovoir. (leaking from the little hole on top of the cap). my question is, does anyone know is this a bad cap? or some kind of blockage in drive forcing fluid out of the top of cap? any suggestions would be greatly appreciated. Thanks


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    #2
    Was the drive lube recently changed/overfilled? The venting system in the cap can become plugged causing pressure to build up in the reservoir. The pressure can cause leakage as you've described. Some guys drill a small hole in the cap as an alternative method to allow the reservoir to better vent itself, haven't tried it myself though.
    Dave
    Edmonds, WA
    "THE FIX"
    '93 2556
    Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

    The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
    Misc. projects thread
    https://www.baylinerownersclub.org/f...56-gctid789773

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      #3
      I just started having the same problem. It was in conjunction with another issue. The kids were out tubing last week and we were on our way in when all of a sudden it seemed the engine popped out of gear. I was able to limp in as long as I kept the speed under 7 MPH. I could smell the drive lube so I waited till I was home to pull the drain plug. Good thing as there was lube everywhere in the engine compartment and the reservoir was completely empty and I know it was full before we headed out.

      After some research I figured the main problem was either a spun prop hub or engine coupler. But that doesn't explain the drive lube problem. I pulled off the outdrive and replaced the gasket and o-rings. I also did a complete drive lube change. I put in Merc 90 weight synthetic per a recommendation from my local marina. Filled the reservoir to the line and expected to see it drop a little due to the air pocket in the outdrive above the vent screw. I took a prop off another outdrive I had and headed to the water today. Fired up my 1950 and cruised around a little and all seemed fine (thankfully!). Had the kids meet me at the dock with the tube and pulled the kids around for two hours with no problem. When I got home I pulled the engine cover off and again there was some lube on the alternator and a little in the bilge. Not nearly the amount of last week but still concerning. Tomorrow I'll take a look at the cap. I may try drilling a small hole to see if it helps or I'll just replace the cap with a new one. Hoping that the problems that simple.

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        #4
        no i replaced the drive oil at end of May and used boat several times since. i did notice a little oil leaking after a couple of the trips. might drill small hole for now and order and order a new cap. Thanks for your input

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          #5
          I'm gonna do the same and see what happens. Thanks. i will re-post results

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